US10421241B2 - Drum for producing a tire blank - Google Patents
Drum for producing a tire blank Download PDFInfo
- Publication number
- US10421241B2 US10421241B2 US15/542,099 US201615542099A US10421241B2 US 10421241 B2 US10421241 B2 US 10421241B2 US 201615542099 A US201615542099 A US 201615542099A US 10421241 B2 US10421241 B2 US 10421241B2
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- United States
- Prior art keywords
- sectors
- drum
- expander
- adjuster
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/24—Drums
- B29D30/242—Drums for manufacturing substantially cylindrical tyre components without cores or beads, e.g. treads or belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/24—Drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/24—Drums
- B29D30/244—Drums for manufacturing substantially cylindrical tyre components with cores or beads, e.g. carcasses
- B29D30/245—Drums for the single stage building process, i.e. the building-up of the cylindrical carcass and the toroidal expansion of it are realised on the same drum
Definitions
- the invention relates to drums for producing green tires.
- the elements that form the assembly made up of the crown belt and the tread of a green tire for a wheel are assembled on a tire-building drum, also known as a “crown form”. These elements mainly comprise raw rubber. Once assembled, the tread is removed from the drum and applied to a carcass produced separately. The combination of the two forms a tire. The shaping of the latter yields the green blank which is then cured to vulcanize the rubber.
- the circumferential face of the drum which serves to support the tread during production is formed by sectors that are mounted so as to be able to move in a radial direction. Thus, retraction of all or some of the sectors allows the tread to be extracted once its assembly has been completed.
- a drum of this type is known for example from the document EP-1 389 520.
- the advantage of that drum is that it ensures good absorption of radial loads, in particular during the wrapping of a strip around the drum at high speed in order to produce the tread.
- the adjustment of the diameter of the drum provides little choice for the positions of the sectors and is difficult to effect.
- the diameter of the drum has been adjusted, it is not possible to vary this diameter while retaining the overall shape of the drum.
- a drum for building a green tire casing which comprises:
- the expansion means being usable regardless of a position of the sectors under the effect of the adjustment means.
- the diameter of the drum has been chosen with the aid of the adjustment means, it remains possible to vary this diameter while retaining the overall configuration of the drum, for example in order to remove the tread from the drum. It is thus possible to carry out repeated expansion and retraction movements of the drum while retaining precise adjustment of the diameter of the drum.
- This also allows a saving of space, since it is no longer necessary to have several drums having different diameters, from a given range of diameters, a single drum according to the invention having a variable diameter, and also a saving of time, since any dismounting/mounting of the drum from/on the assembly machine is avoided.
- the expansion means and/or the adjustment means are able to move the sectors along a path perpendicular to the axis.
- the adjustment means are disposed in series with at least some of the expansion means.
- the adjustment means are disposed in series with only some of the expansion means.
- some of the expansion means are designed to take up a fixed position in the radial direction with respect to the axis.
- the adjustment means connect the expansion means to a support of the drum.
- the adjustment means and/or the expansion means form an irreversible mechanism.
- only the adjustment means form an irreversible mechanism.
- only the expansion means form an irreversible mechanism.
- the adjustment mechanism and the expansion mechanism each form an irreversible mechanism.
- the adjustment means comprise at least one cam mounted so as to be able to rotate about the axis.
- This arrangement makes it notably possible to retain two radial supporting means for each sector.
- the expansion means comprise at least one cylinder and components that are designed to convert a load on the cylinder parallel to the axis into a radial load.
- the expansion means are designed such that the components form at least one group in which the hinge pins of the components of the group extend in one and the same plane radial to the axis.
- At least two upstream parts which are connected together by at least one synchronization member that is separate from the adjustment means and the sectors.
- the expansion means comprise at least one upstream plate that is able to load at least one support of the expansion means that is mounted so as to slide against the plate.
- the expansion means and the adjustment means are designed such that each sector is connected to a support of the drum that is common to the sectors by means of the two mutually independent supporting means.
- each sector is a single part and/or rigid.
- Also provided according to the invention is a method for producing a green tire, wherein at least a part of the green tire is produced on a drum in accordance with the invention.
- FIGS. 1 and 2 are perspective views of a drum according to one embodiment of the invention, all of the sectors being present in FIG. 1 and only one sector being present in FIG. 2 ;
- FIGS. 3 to 6 are partial views in axial section of the drum from FIG. 1 , showing different configurations of the sectors;
- FIG. 7 is a view similar to FIG. 3 , showing the connecting means of the cams
- FIG. 8 is a perspective view of a part of the drum in the region of the cams
- FIG. 9 is a view on a larger scale of a part of the drum from FIG. 4 .
- FIG. 10 is a view on a larger scale of a part of the drum from FIG. 2 , similar to the latter.
- the figures illustrate a drum 2 according to one embodiment of the invention.
- This drum is used for assembling the elements that form a tread for a green tire blank.
- the tire is intended for a wheel of a vehicle that may be a utility vehicle, a light vehicle, a passenger vehicle, a vehicle of the heavy goods type or alternatively a construction plant vehicle.
- the drum comprises a central support or shaft 4 and has an overall shape exhibiting symmetry of revolution of axis 6 which forms the main axis of the drum.
- axis 6 which forms the main axis of the drum.
- the drum has external sectors 8 which extend at the periphery of the drum to form the external circumferential face 10 of the drum that forms the working face on which the green tire elements are disposed.
- this face 10 has the overall shape of a cylinder of circular cross section in a plane perpendicular to the axis 6 . Therefore, the drum here forms for example what a person skilled in the art often refers to as a “flat form”.
- each sector 8 is rigid and formed from a single part. It has here the overall shape of a comb.
- the sector has a rectangular overall shape, the largest dimension of which is parallel to the axis 6 .
- the two longitudinal edges of the rectangle are cut to form teeth such that each edge of a comb has teeth that are able to interlock with the teeth on the edge of the adjacent comb.
- this shape of the sectors makes it possible to vary their distance with respect to the axis while ensuring a degree of continuity of material between the combs around the circumference of the drum, the teeth of the adjacent combs being interlocked to a greater or lesser extent depending on the radial position of the sectors.
- the drum has a cam 12 comprising a plate of annular shape having two faces perpendicular to the axis 6 , said plate being mounted so as to be able to rotate coaxially about the latter.
- the cam extends in the left-hand part of the drum and has, on its right-hand face 14 , also visible in FIG. 8 , a groove 16 in the form of a spiral centred on the axis 6 .
- a drive (not shown) sets the cam in rotation about the axis with respect to the support 4 .
- the drum comprises a disc 18 , also perpendicular to the axis 6 and centred on the outlet, which comprises radial housings 20 that are visible notably in FIG. 8 .
- Each of these housings receives a jaw 22 that is mounted so as to be able to slide in the housing in a direction perpendicular to the axis with respect to the disc.
- each housing 20 With the disc 18 being side-by-side with the cam 12 , each housing 20 is open in the direction of the latter in order to allow the jaw to engage with the spiral 16 .
- the jaw has teeth 24 complementary to the spiral. It also has a rear lower lug 26 that extends in the opposite direction to that of the cam.
- Each jaw housing comprises upper 101 and lower 102 abutments, referenced in FIG. 4 , that define the extreme points of the end of sliding travel of the jaw.
- the jaw/spiral system which is part of the adjustment means, thus forms an irreversible mechanism.
- the drum also comprises a connecting-rod support 28 and two rectilinear connecting rods 30 and 32 , each of which is hinged directly to the support.
- the connecting rod 30 is hinged directly to the lug 26 .
- the two connecting rods and the connecting-rod support form a toggle joint.
- the drum also comprises a sector support 34 .
- the support has an elongate shape in a direction parallel to the axis 6 and has, in the left-hand part, a base to which the connecting rod 32 is directly hinged. All of the hinge pins of the connecting rods are mutually parallel and extend in a direction that is orthogonal to the axis 6 and does not intersect the latter.
- the hinge pins that hinge the connecting rods to the connecting-rod support 28 extend in one and the same plane perpendicular to the axis 6 . The same goes for the two other hinge pins that hinge the connecting rods to the lugs 26 and to the sector support 34 , respectively.
- the drum comprises, in the right-hand part in FIG. 3 , analogous parts that take up a symmetrical position to those which have just been described. Therefore, a cam 12 , a disc 18 with jaws 22 , a connecting-rod support 28 , connecting rods 30 and 32 and another stand for the same sector support 35 are found.
- the sector 8 is rigidly fixed to the sector support 34 such that the position of the latter entirely determines the position of the sector.
- the drum also comprises two actuating plates 36 that each also extend in a plane perpendicular to the axis and are centred on the latter.
- the plates are mounted so as to slide on the central support 4 .
- the drum comprises four actuators 40 that are each, in this particular instance, in the form of a pneumatic cylinder, comprising a body 42 and a piston 44 .
- the free end of the piston is connected to the left-hand plate 36 , while the opposite end of the body from the piston is rigidly fixed to the right-hand plate.
- the cylinders are in this case housed inside the drum.
- the left-hand face 45 of the left-hand plate 36 on the opposite side from the cylinder, forms a sliding track for the connecting-rod support 28 . The same goes in the right-hand part of the drum for the other plate and the other connecting-rod support.
- the drum comprises a median pinion 60 that is mounted so as to be able to rotate in the shaft 4 about a radial axis perpendicular to the axis 6 .
- This pinion is engaged with two racks 62 that are respectively secured to the two actuating plates 36 .
- This arrangement ensures symmetrical movement of these plates on either side of the mid-plane of the drum.
- Each rack is partially housed in a housing 67 in the opposite plate, while the plates are in their closest-together configuration.
- Another rack and pinion assembly is also provided, in a position diametrically opposite the first.
- the drum also comprises three positioning discs 46 that are rigidly fixed to the support 4 .
- one of the discs 46 helps to keep the cam 12 in position.
- it extends at a distance from the other disc 46 of the left-hand part so as to define with the latter a housing in which an arm 48 secured to the sector support 34 is mounted so as to slide in a direction perpendicular to the axis.
- another arm 48 of the sector support is also mounted so as to slide in a direction perpendicular to the axis against a face of the third disc 46 .
- the three positioning discs 46 and the two arms 48 thus radially guide the sector support during its movement.
- Each sector support thus has its own pair of guide arms 48 .
- the majority of components of the drum are made of metal, for example some of aluminium and others of steel.
- FIGS. 3 and 4 illustrate the drum in the retracted and extended configurations, respectively.
- the cylinders 40 are actuated, the elongation of which causes the plates 36 to move apart from one another in the direction of the axis 6 .
- the mutual spacing apart of the plates 36 takes place symmetrically with respect to the mid-plane of the drum perpendicular to the axis 6 .
- the extended configuration is thus irreversible, since it is maintained by two irreversible mechanisms which are the expansion means and the jaw/spiral system.
- the drum is capable of withstanding, without energy input, a radial load directed toward the axis 6 when a tread is applied under tension.
- the system is self-locking since the two irreversible mechanisms are disposed in series.
- the actuation of the cylinders 40 in the reverse direction causes the plates 36 to move toward one another and return to the configuration in FIG. 3 .
- These expansion means thus also form retraction means.
- the toggle joint formed by the connecting-rod support 28 and the connecting rods 30 , 32 allows, once under load, the passage from the extended configuration to the retracted configuration under the effect of a small cylinder force.
- the cams 12 and the jaws 22 form adjustment means for adjusting the diameter of the drum, which are usable independently of the actuation of the expansion means.
- the cams 12 are set into rotation. Said cams, engaged with the jaws 22 , cause the latter to slide in a direction perpendicular to the axis and opposite to the latter so as to lead to a configuration of the type shown in FIG. 5 .
- the jaws of each sector entrain, in their sliding movement, the two connecting rods with their support 28 and also the sector support 34 , the connecting-rod support 28 sliding against the track 45 .
- the system has thus passed from the configuration in FIG. 3 to the one in FIG. 5 under the effect of the adjustment means and without the expansion means being actuated.
- FIGS. 3 and 5 correspond to the ends of travel of the cams and the jaws. The same goes for FIGS. 4 and 6 . However, it is quite possible to choose an adjustment of the diameter of the drum which is intermediate between these two positions.
- the mechanism of this drum thus makes it possible to choose any position of the adjustment means and then, in this position, to control the expansion means. Conversely, it makes it possible to choose any position of the expansion means and then to control the adjustment means so as to arrive at any desired position.
- the smallest diameter of the drum is thus obtained when the adjustment means and the expansion means are each placed in the smallest-diameter configuration. The same goes analogously for the largest-diameter configuration.
- the adjustment means connect the expansion means to the central support 4 of the drum.
- the adjustment means are disposed in series with only part of the expansion means, formed by the connecting rods 30 , 32 and their support 28 .
- the other part of the expansion means, formed by the cylinders 40 and the actuating plates 36 is designed to occupy a fixed position in a radial direction with respect to the axis.
- the actuating plates 36 form an upstream part, with reference to a direction of transmission of the movement of these means, that is able to load the connecting-rod support 28 of these expansion means.
- the expansion means and the adjustment means are designed such that each sector 8 is connected to the shaft 4 , common to the sectors, by means of two mutually independent supporting means.
- FIG. 7 illustrates a member for synchronizing the movement of the two cams which comprises a rod 50 parallel to the axis 6 but spaced apart from the support 4 .
- This rod bears two pinions 52 that are rigidly fixed to the rod and are each engaged with a toothed sector of one of the cams 12 .
- This same rod can be used to drive the cams in rotation by connecting the rod to a suitable drive (not illustrated).
- each actuating plate 36 has a lip that is contiguous with the shaft 4 , directed towards the plate bearing the cam 12 and provided with an axial annular extension 66 fixed to the plate for example by means of screws 68 .
- the actuating plates 36 take up their most spaced-apart position, they are in axial abutment against the supports of the cams via these extensions 66 , as illustrated in FIGS. 4 and 6 .
- the proper dimensioning of these extensions via their machining for example, makes it possible to adjust the position of the aligned actuating plates. Provision can be made for the plates to be made of aluminium while the extensions forming abutment parts are made of steel.
- each rack 62 is connected to the associated actuating plate 36 by way of a support part 70 .
- the latter is fixed to the plate by a screw 72 .
- the rack has a notch into which a relief on the support part 70 penetrates in order to secure them together in terms of axial movement.
- the rack is entirely held in the support part by nesting, so as to avoid the arising of any stresses and to generate static indeterminacy.
- the axial dimension of the support part is chosen, for example by machining, so as to regulate the axial position of the rack with respect to an associated plate. This choice also takes place here by placing the drum in a configuration of the type shown in FIGS. 4 and 6 . It is effected such that the racks give the plates in axial abutment a position such that the hinge pins of the left-hand and right-hand connecting rods are contained in their respective planes P 1 and P 2 .
- This drum serves to produce a green tire blank, for example to build a tread.
- the diameter of the drum is chosen with the adjustment means, and then the expansion means are placed in the extended configuration.
- a tread is then formed by assembling various elements on the sectors while the drum is in rotation. It is notably possible to wrap one or more longitudinally reinforced strips of raw rubber at high speed in order to realize hooping of the crown belt. This wrapping can take place with relatively high tension of the strip, the absorption of loads being ensured within the drum as explained above.
- the expansion means can be actuated in order to pass the drum into the retracted configuration in order to remove the tread.
- the drum is then returned into the extended configuration by controlling the expansion means, and a new tread is formed as above.
- the mechanism is sufficiently flexible and robust to make it possible for the expansion means to be actuated at relatively high speed and a very large number of times in a single day, for example several tens or several hundreds of times in order to construct just as many treads. It will furthermore be common to actuate the adjustment means only a few times during the day when the model is changed.
- This drum is sufficiently rigid in the extended position to take high radial loads without deformation of the laying surface. For example, it is able to withstand a load of 120 daN per sector when a tire casing for a passenger vehicle is being manufactured. No deformation under the effect of the load is observed, for example coning or undesired collapsing of the median diameter. Given that the sectors are each joined to supporting means, loads are absorbed regardless of the location of the sector at which the load is exerted. Specifically, this location can vary along the axis 6 during the wrapping of a strip to produce the green tire.
- the invention has the following advantages:
- the drum could be used to manufacture a part of the green tire other than the tread.
- the sectors could be given a curved shape or any other profile.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Tyre Moulding (AREA)
Abstract
Description
-
- sectors that form a circumferential face of the drum,
- expansion means that are able to move the sectors in a radial direction with respect to an axis of the drum such that, at any time during the movement, all of the sectors extend at one and the same distance from the axis, and
- adjustment means that are separate from the expansion means and are able to move the sectors in a radial direction such that, at any time during the movement by the adjustment means, all of the sectors extend at one and the same distance from the axis,
-
- the drum exhibits radial rigidity when it is in the extended configuration, this making it notably possible to lay a tread or some other product under tension.
- it is possible to use the expansion means at any adjustment of the adjustment means.
- the presence of adjustment means and of expansion means on one and the same drum allows a saving of space since it is not necessary to have several different drums for a given range of drum diameters, this also avoiding any dismounting of the drum from the machine.
- the expansion means are simple and can be used a large number of times in one day. They also allow good reproducibility of the laying surface of the desired product.
- in the extended configuration, on account of the connecting rods, the load to be supplied by the cylinders is zero.
- the extended configuration is maintained by virtue of two irreversible mechanisms formed by the alignment of the connecting rods and the jaw/spiral system in series. The device in this configuration is self-locking and allows transmission of purely radial loads.
- once under load, a very small force is required to pass from the extended configuration to the retracted configuration by virtue of the mechanical toggle joint formed by the two connecting rods and the connecting-rod support.
- in theory, there is no transmission of axial load, the loads being purely radial.
- the adjustment means are centralized, they make it possible to modify the position of all of the sectors at the same time and in an identical manner. These adjustment means do not require any dismounting.
Claims (17)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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FR1550379 | 2015-01-16 | ||
FR1550379A FR3031695B1 (en) | 2015-01-16 | 2015-01-16 | DRUM MAKING A PNEUMATIC BRAKE |
PCT/FR2016/050071 WO2016113510A1 (en) | 2015-01-16 | 2016-01-15 | Drum for producing a tyre blank |
Publications (2)
Publication Number | Publication Date |
---|---|
US20180272641A1 US20180272641A1 (en) | 2018-09-27 |
US10421241B2 true US10421241B2 (en) | 2019-09-24 |
Family
ID=52988284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/542,099 Active 2036-10-16 US10421241B2 (en) | 2015-01-16 | 2016-01-15 | Drum for producing a tire blank |
Country Status (5)
Country | Link |
---|---|
US (1) | US10421241B2 (en) |
EP (1) | EP3245052B1 (en) |
CN (1) | CN107107506B (en) |
FR (1) | FR3031695B1 (en) |
WO (1) | WO2016113510A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3059593A1 (en) | 2016-12-07 | 2018-06-08 | Compagnie Generale Des Etablissements Michelin | DRUM FOR MANUFACTURING BLANKET OR PNEUMATIC COMPONENT |
FR3083475B1 (en) * | 2018-07-05 | 2021-11-05 | Michelin & Cie | DEVICE FOR MANUFACTURING A TIRE INCLUDING NEEDLES |
CN109875320B (en) * | 2019-02-28 | 2019-11-22 | 高秀铃 | A kind of gorros showing stand |
FR3099407B1 (en) * | 2019-08-01 | 2021-07-02 | Michelin & Cie | EXPANDABLE DRUM FOR CONFORMING PNEUMATIC BANDAGES INCLUDING A PARALLELOGRAM EXTENSION DEVICE FOR HOLDING THE ROD |
EP3825109A1 (en) * | 2019-11-22 | 2021-05-26 | Marangoni Meccanica S.P.A. | Forming group with continuous radial and axial adjustment, for forming tyres |
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US20180141294A1 (en) * | 2015-05-05 | 2018-05-24 | Marangoni Meccanica S.P.A. | Tire building drum |
-
2015
- 2015-01-16 FR FR1550379A patent/FR3031695B1/en not_active Expired - Fee Related
-
2016
- 2016-01-15 EP EP16703573.2A patent/EP3245052B1/en active Active
- 2016-01-15 US US15/542,099 patent/US10421241B2/en active Active
- 2016-01-15 WO PCT/FR2016/050071 patent/WO2016113510A1/en active Application Filing
- 2016-01-15 CN CN201680005584.9A patent/CN107107506B/en active Active
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Also Published As
Publication number | Publication date |
---|---|
FR3031695B1 (en) | 2017-02-24 |
EP3245052A1 (en) | 2017-11-22 |
FR3031695A1 (en) | 2016-07-22 |
US20180272641A1 (en) | 2018-09-27 |
WO2016113510A1 (en) | 2016-07-21 |
EP3245052B1 (en) | 2019-05-08 |
CN107107506A (en) | 2017-08-29 |
CN107107506B (en) | 2019-11-15 |
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